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Biostratigraphic precision of the Cruziana rugosa group: a study from the Ordovician succession of southern and central Bolivia

Published online by Cambridge University Press:  09 February 2007

SVEN O. EGENHOFF ,
BERND WEBER ,
OLIVER LEHNERT  and
JÖRG MALETZ
SVEN O. EGENHOFF
Affiliation:
Colorado State University, Department of Geosciences, 322 Natural Resources Building, Fort Collins, CO 80523-1482, USA
BERND WEBER
Affiliation:
Freie Universität Berlin, Institut für Geologische Wissenschaften, Fachrichtung Geologie, Malteserstrasse 74-100, D-12249 Berlin, Germany
OLIVER LEHNERT
Affiliation:
University of Erlangen, Institute of Geology and Mineralogie, Schlossgarten 5, D-91054 Erlangen, Germany
JÖRG MALETZ
Affiliation:
Department of Geology, State University of New York at Buffalo, 772 Natural Sciences and Mathematics Complex, Buffalo, New York 14260-3050, USA
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Abstract

Cruziana ichnospecies have been repeatedly reported to have biostratigraphic significance. This study presents a re-evaluation of the arthropod ichnotaxa of the Cruziana rugosa Group from bio- and/or lithostratigraphically well-defined Lower to Upper Ordovician siliciclastic sections of southern and central Bolivia. With the exception of Cruziana rouaulti, the ichnofaunas contain all the members of the Cruziana rugosa Group throughout the Ordovician (Arenig to Caradoc) successions in Bolivia. The Bolivian material therefore indicates that these arthropod ichnofossil assemblages are suitable for recognizing Ordovician strata in Bolivia. These findings cast doubt on their use as reliable indicators for a global intra-Ordovician (Arenig to Caradoc) biozonation of Peri-Gondwanan sedimentary successions.

Keywords

CruzianabiostratigraphyBoliviaOrdovician
Type
Original Article
Information
Geological Magazine , Volume 144 , Issue 2 , March 2007 , pp. 289 - 303
Copyright
© 2007 Cambridge University Press

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